Regular Expression Denial of Service (ReDoS)
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Affected versions: < 2.11.3
Sourced from The GitHub Security Advisory Database.
High severity vulnerability that affects Jinja2 and jinja2
In Pallets Jinja before 2.10.1, str.format_map allows a sandbox escape.
This contains a fix for a speed issue with the urlize filter. urlize is likely to be called on untrusted user input. For certain inputs some of the regular expressions used to parse the text could take a very long time due to backtracking. As part of the fix, the email matching became slightly stricter. The various speedups apply to urlize in general, not just the specific input cases.
Improve the speed of the urlize filter by reducing regex backtracking. Email matching requires a word character at the start of the domain part, and only word characters in the TLD. 1343
Version 2.11.2
Released 2020-04-13
Fix a bug that caused callable objects with __getattr__, like ~unittest.mock.Mock to be treated as a contextfunction. 1145
Update wordcount filter to trigger Undefined methods by wrapping the input in soft_str. 1160
Fix a hang when displaying tracebacks on Python 32-bit. 1162
Showing an undefined error for an object that raises AttributeError on access doesn't cause a recursion error. 1177
Revert changes to ~loaders.PackageLoader from 2.10 which removed the dependency on setuptools and pkg_resources, and added limited support for namespace packages. The changes caused issues when using Pytest. Due to the difficulty in supporting Python 2 and 451 simultaneously, the changes are reverted until 3.0. 1182
Fix line numbers in error messages when newlines are stripped. 1178
The special namespace() assignment object in templates works in async environments. 1180
Fix whitespace being removed before tags in the middle of lines when lstrip_blocks is enabled. 1138
~nativetypes.NativeEnvironment doesn't evaluate intermediate strings during rendering. This prevents early evaluation which could change the value of an expression. 1186
Version 2.11.1
Released 2020-01-30
Fix a bug that prevented looking up a key after an attribute ({{ data.items[1:] }}) in an async template. 1141
Version 2.11.0
Released 2020-01-27
Drop support for Python 2.6, 3.3, and 3.4. This will be the last version to support Python 2.7 and 3.5.
Added a new ChainableUndefined class to support getitem and getattr on an undefined object. 977
Allow {%+ syntax (with NOP behavior) when lstrip_blocks is disabled. 748
Added a default parameter for the map filter. 557
Exclude environment globals from meta.find_undeclared_variables. 931
Float literals can be written with scientific notation, like 2.56e-3. 912, 922
Int and float literals can be written with the '_' separator for legibility, like 12_345. 923
Fix a bug causing deadlocks in LRUCache.setdefault. 1000
The trim filter takes an optional string of characters to trim. 828
A new jinja2.ext.debug extension adds a {% debug %} tag to quickly dump the current context and available filters and tests. 174, 798, 983
Lexing templates with large amounts of whitespace is much faster. 857, 858
Parentheses around comparisons are preserved, so {{ 2 * (3 < 5) }} outputs "2" instead of "False". 755, 938
Add new boolean, false, true, integer and float tests. 824
The environment's finalize function is only applied to the output of expressions (constant or not), not static template data. 63
When providing multiple paths to FileSystemLoader, a template can have the same name as a directory. 821
Always return Undefined when omitting the else clause in a {{ 'foo' if bar }} expression, regardless of the environment's undefined class. Omitting the else clause is a valid shortcut and should not raise an error when using StrictUndefined. 710, 1079
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Bumps jinja2 from 2.10 to 2.11.3. This update includes security fixes.
Vulnerabilities fixed
Sourced from The GitHub Security Advisory Database.
Sourced from The GitHub Security Advisory Database.
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Sourced from jinja2's releases.
Changelog
Sourced from jinja2's changelog.
... (truncated)
Commits
cf21539
release version 2.11.315ef8f0
Merge pull request #1343 from pallets/urlize-speedupef658dc
speed up urlize matchingeeca0fe
Merge pull request #1207 from mhansen/patch-12dd7691
Merge pull request #1209 from mhansen/patch-34892940
do_dictsort: update example ready to copy/paste7db7d33
api.rst: bugfix in docs, import PackageLoader9ec465b
fix changelog header737a4cd
release version 2.11.2179df6b
Merge pull request #1190 from pallets/native-evalDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase
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